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Poster: archivefan Date: Oct 8, 2003 8:48pm
Forum: prelinger Subject: Re: Flawed transfers?

The reason these transfers are flawed with the noticable vertical banding is because they were encoded at the nonstandard resolution of 368x480. They SHOULD have been encoded at 1/2 D1 resolution which is 352x480. The 16 pixel horizontal offset makes these films look jagged and the unfortunate consequence is that it can't be smoothed out or eliminated. Re-encoding those 368x480 films to 352x480 will not eliminate the jaggies because of how the initial digitalization was done. Only way is to go back to the analog source and do the digital conversion at the 1/2 D1 native resolution. (It is doubtful if this will be done in the future, but maybe Mr. Prelinger or his digitalization guy will surprise us!)

A few of the films are 2/3 D1 res. at 480x480 native resolution.

It appears that all of the newest crop of films were correctly encoded at 352x480. You will notice that these look very smooth and natural.

No amount of inverse telecining, smooth filtering, etc will get rid of those rough vertical edges, I'm afraid.

I hope this has helped shed some light on the issue for those who were perplexed on this issue.

-archivefan

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Poster: Ethan Date: Oct 8, 2003 11:45pm
Forum: prelinger Subject: Re: Flawed transfers?

Thanks for the heads up!